Heat sink of a lamp



FIG. 1 is a perspective view of a heat sink of a lamp showing my new design;

FIG. 2 is a left side elevational view of the heat sink of a lamp;

FIG. 3 is a top plan view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a bottom plan view thereof; and,

FIG. 6 is a reference view thereof.

The right side elevational view is the same as the left side elevational view shown in FIG. 2.

The rear elevational view is the same as the front elevational view shown in FIG. 4.

The broken lines in the drawings that illustrate a lamp and portions of the heat sink are employed to illustrate environmental structure only and form no part of the claimed design. 

CLAIM The ornamental design for a heat sink of a lamp, as shown and described. 